* {
    margin: 0;
    padding: 0;
}

body > div:nth-child(2) {
    display: flex;
    justify-content: center;
}

.top {
    height: 100px;
    background-color: skyblue;
    display: flex;
    justify-content: space-between;
    padding: 0 50px;
    align-items: center;
}


.left {
    width: 200px;
    background-color: gray;
    height: calc(100vh - 100px);

}

.left div {
    width: 100%;
    text-align: center;
}

.left div div {
    height: 50px;
    line-height: 50px;
}

.left div div:hover {
    background-color: slateblue;
}

.right {
    width: calc(100vw - 200px);
    height: calc(100vh - 100px);
}